COMPARISON OF ADJECTIVES
AS + ADJECTIVE + AS
To compare people, places, events or things, when there is no difference, use as + adjective + as:
�         Peter is 24 years old. John is 24 years old. Peter is as old as John. 
More examples:
�         Moscow is as cold as St. Petersburg in the winter.
�         Ramona is as happy as Raphael.
�         Einstein is as famous as Darwin.
�         A tiger is as dangerous as a lion. 
NOT AS + ADJECTIVE + AS
Difference can also be shown by using not so/as ...as:
�         Mont Blanc is not as high as Mount Everest
�         Norway is not as sunny as Thailand
�         A bicycle is not as expensive as a car
�         Arthur is not as intelligent as Albert